Carburetor



NOV. 11, 1952 H; E SHULTZ 2,617,639

CARBURETOR Filed May 1, 1950 2 SHEETSSHEET 2 Harry Esfe/ Shu/lz INVENTOR;

I By M Patented Nov. 11, 1952 OFFICE.

.GARBUREFBOR HarryEst'el Shultz; West 110s "AngeleafCalif. "AnplicatiomMayrl 1950; -Serial-N mil-59,272

:1: .Thissinvcntion relates; .-to; ..carburetors for. use internal 1 combustion; engines and the like, whichare; used; tozfcrm an explosivev mixture of ainandi gaseousgfuelasuchz as-gasoline. onkerosene. An object of: theainyention'is ton-provide: a

carburetoroi-yextreme. simplicity of. structure having; .a-.. minimum. number of; operating par-.ts due=-to the elimination of theusuall control for thetliquidifuel-l ,It is! a further object; of. the; invention. to pro vide: a-. ca-r-bureton irrwhich the relative, amount ct: gasoline lvapor and; air maybe=easily regulated, and whichcarburetor is. provided with means whereby the suction from the; engine. automatically' maintains-a uniform-richness of. mixture by increasing oudecreasing the: amountlot air and. gasolinavapor deliveredto themixing cham- Still. another object: oisthe: invention 1 is to. pro.- vide a; carburetor whereby the relative proportionsof gasoline and air. may be regulated. and the; uniformity of the: mixture maintained. withoutithe need oia float.

Stillifurthencbj ects ot the inventiona'es-ider in theprovisi'on; of a carburetor that is strong, durable highly eiiicient. in operation, simple in; construction; and manufacture; capable of. being readily installedon. the manifold. -of1 the. automotivevvehicla and which is; relatively inexpensive.

ieets oiithewinvention "which will become-rape parentas the followingidescription-i proceeds, are attained by thiscarbure-tor, atpre-ferred embodi.-. men-t ot haspbeen illustrated the-ac.- compaiming; drawings, by at example only; wherein:

Figures 15 is; a: vertical: sectional View of; the' .'in.-- vention. showing the component parts thereof;

- 2115134?- horizontalsect-ional'viewasgta-lren mung; th'eiline 2 -.Z;of-'Figure1- .Eigurei3 is: a horizontal secticnakviewaataken alongtheline te-tinr-Eigure. l

iliigure:v e-

arrv elevationalt view 0f: the. central memben comprising anzimpontanteiement; of the; carburetor; M

Eignres..5. andfi. areselevational details showing means for'thefuel outlet;

Figurel'l is an'elevational-.-view-otthe fuel mixing element of the, carburetor and FigureS is a horizontal sectional? view as taken along the line 8--8 in Figure '7.

With; continuing."refcrenceeitoithez accompanying drawings wherein like, reference numerals designate. similar parts throughout the various views, .reference numeral [0 generally designates the improved carburetor comprising the pres.- ent. invention.

i..'l2hes. arburtor f0 includesallower chamber havingmaJflange M for securing the. carbuclaims. (CI; 261- 501 by a handle 56.

of' the. internal combustion. engine.

meter to the. manifold of theinternalsoonibustion. engine, A, cylindrical: body termed; with. the. chamber 12.. and. is in communicatiorr with. the atmosphere. .Mountedcn the lowerchamber l2 iSuan upperchamber fawhich is provided with a bottoni;Wallaon-flange;1211.v .A. gasket; 2-2 is positioned; between the.=.flange 20v and the upper wall-.ofthe ChBJIIlbE-I LZ: and screws 35and 38 are. provided between the upper chan-rber wall I Br and" the flange '32 so as .toinsurethe air-tightseal. As. the upper end of the central member 26- is threaded asgat. fli -a holdin nut lz is provided for securely fastening the lid--34 in position.v

A vertical passage 44 is formed in thecentral member 26 and a needle valve 4.5 is positioned within an enlarged opening of the passage for controlling the fiow of. fuel from the upper chamber through the axial or transverse. passage 50. in. the. central member. A gasoline. intake tube 52. is, provided and attached to the central member 2b in communication with the vertical passageway At The needle valve 8.6 is held in position by a paclring'nut 5'4 and. is controlled In the central member. 26; and controlling the vertical passage 44 isa shaft 58' having a transverse opening 6.0 therein thus creating a valve for controlling the flow of fuel from, the upper chamber [8. through. the, pas' sageway t4. Secured. to-the shaft 53 is a control' arm. 61 which is connected to a suitable, link mechanism 64- to, a bifurcated. element 6,6 atta-chedj to a. butterfly valve .68 operatively scontrolled by an arm 1.0 actuated by the throttle A, screwactuated valve control, screw '12 is, provided to. pre-setthe fueland gas supply ratio.

Threadedly secured to, the central member 26' and, forming a portion thereof, is a'fuel mixing element 74. which includes a tubular'mem'ber, 16

having a plurality of angularly disposed'slots 18 therein. which slotsyare disposedjat 'anxangl'e of 40 degrees from the, vertical in order to break up. the fuel. and to permit the mixing thereof j with theintake air from the cylindrical body [6.

A choke operated butterfly valve '80 ismount'ed in the body [6 and is controlled by the choke operatedv lever arm 82'. The butterfly valvesiflfi an'd 6j8icpermit. or prevent, the passage, ofair'into 0? the lower; or mixingchamber Ill" and. the gasoline it is: integrally intake line 84 permits the passage of fuel from the gasoline tank into the fuel bowl or upper chamber l8.

The carburetor. comprising the present invention operates by motor suction alone, not requiring an external gasoline pump. The valve controlled butterfly valve 68 and hence the fuel regulator valve 60 is opened and the choke butterfly valve 82 is normally closed upon starting of the engine, thus closing the intake vacuum to act through the needle valve 45. The vacuum in the intake manifold draws the gasoline through the gasoline supply line into the gas bowl or chamber 18. The manifold suction first draws all of the air out of the gasoline chamber and the gas line, and then fills the entire upper chamber with gasoline. Then as much gasoline is needed for the engine and no more is drawn through the gasoline intake line- 52 into the vertical passageway 44. Passing through the valve 66 which controls the amount of gasoline reaching the air gas mixing element 18, the gasoline is carried out in a circular memberthrough the-element l8. After the vacuum has filled the gasoline bowl or chamber 18 and enough gasoline has been drawn down into the manifold to begin combustion, the choke butterfly is opened. As the valve 80 is opened increasing the flow of fuel, the butterfly valve 68 is also opened allowing a greater supply of air. engine increases the engine demand increases creating a greater supply of both air through the valve controlled butterfly valve and the gasoline through the valve 68. The throttle maintains a state of equilibrium between these two valves andthus regulate the speed of the engine.

'Since from the foregoing the construction and advantages of this carburetor are readily apparent, further description is believed to be unnecessary.

However, since numerous modifications will readily occur to those skilled in the art after a consideration of the foregoing specification and accompanying drawings, it is not intended to limit the invention to the precise embodiment shown and described, but all suitable modifications and equivalents may be readily resorted to which fall within the scope of the appended claims.

Having described the invention, what is claimed as new is:

1. A carburetor comprising a lower chamber having an outwardly extending cylindrical body connected thereto and forming a passageway for air, an upper chamber positioned on said lower chamber, said upper chamber being adapted to contain fuel, the bottom wall of said upper chamber being provided with an aperture, a central member supported by said bottom wall of said upper, chamber extending into said lower chamber, a substantially vertical passage in said member and having a needle valve seat, a first valve journaled in said member for controlling the flow of fuel through said passage, a transverse passage in said member communicating with said vertical passage and opening into said upper chamber, aneedle valve arranged to be disposed on said seat for controlling the flow of fuel through said vertical passage and hence said transverse passage, a butterfly valve in said body, and means operatively connecting saidbutterfly valve andsaid first valve to control the amount of air permitted to pass into said lower chamber relativeto the'amount of fuel permitted to pass from said, upper chamber to said lower chamber, said member including a mixing element com- As the speed of the prising a hollow tubular member in communication with said vertical passage and located below said first valve and said needle valve and in said lower chamber, and a plurality of slots angularly disposed in said tubular member for 'the conduction flow of fuel therefrom.

2. A carburetor comprising a lower chamber having an outwardly extending cylindrical body connected thereto and forming a passageway for air, an upper chamber adapted to contain fuel positioned on said lower chamber, the bottom wall of said upper chamber being provided with an aperture, a central member supported by said bottom wall of said upper chamber extending into said lower chamber, a substantially vertical passage in said member and having a needle valve seat, a first valve journaled in said member for controlling the flow of'fiuel through passage, a transverse passage in said member communicating with said vertical passage and opening into said upper chamber, a needle valve arranged to be disposed on said seat for controlling the flow of fuel through said vertical passage and hence said transverse passage, a butterfly valve in said body, and means operatively connecting said butterfly valve and said first valve to control the amount of air permitted to pass into said lower chamber relative to the amount of fuel permitted to pass from said upper chamber to said lower chamber, said central member including a, mixing element mounted at its lower end.

3. A carburetor comprising a lower chamber having an outwardly extending cylindrical body connected thereto and forming a passageway for air, an upper chamber adapted to contain fuel positioned on said lower chamber, the bottom wall of said upper chamber being. provided with an aperture, a central member supported by said bottom wall of said upper chamber extending into said lower chamber, a substantially vertical passage in said member and having a needle valve seat, a first valve journaled in said member for controlling the flow of fuel through said passage, a transverse passage in said member communicating with said vertical passage and opening into said upper chamber, a needle valve arranged to be disposed on said seat for controlling the flow of fuel through said vertical passage and hence said transverse passage, a butterfly valve in said body, and means operatively connecting said butterfly valve and said first valve to control the amount of air permitted to pass into said lower chamber relative to the amount of fuel permitted to pass from said upper chamber to said lower chamber, said central member including a mixing element mounted at its lower end, said first valve is in the form of a transverse shaft having a transverse opening there,- through, said opening being triangular in crosssection at one end thereof and oval in cross section at the other end.

HARRY ESTEL SH U LTZ.

REFERENCES CITED The following references are of record in the file of this patentz UNITED STATES PATENTS Number Name Date 1,765,654 Carter June 24, 1930 1,841,707 Bracke Jan. 19, 1932 2,126,132 Paasche Aug. 9, 1938 2,297,736 Aymar Oct. 6, 1942 2,315,717 Leibing et al Apr. 6, 1943 2,327,675 Snyder Aug. 24, 1945 

